Dr. David Eimerl Profile

Dr. David Eimerl

at EIMEX Software and Consulting

SPIE Involvement:

Author | Instructor

Publications (16)

Proceedings Article | 23 July 1999 Paper

Modeling of frequency doubling and tripling with converter refractive index spatial nonuniformities due to gravitational sag

Jerome Auerbach, Charles Barker, Scott Couture, David Eimerl, Jim DeYoreo, Lloyd Hackel, R. Hibbard, Lisa Liou, Mary Norton, S. Perfect, Paul Wegner

Proceedings Volume 3492, (1999) https://doi.org/10.1117/12.354161

KEYWORDS: Crystals, Refractive index, Second-harmonic generation, Frequency conversion, Performance modeling, National Ignition Facility, Surface finishing, Nonlinear crystals, Phase velocity, Phase matching

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Proceedings Article | 20 April 1998 Paper

Pulse-shape and pulse-length scaling of ns pulse laser damage threshold due to rate limiting by thermal conduction

Michael Feit, Alexander Rubenchik, Alberto Salleo, David Eimerl

Proceedings Volume 3244, (1998) https://doi.org/10.1117/12.306987

KEYWORDS: Laser damage threshold

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Proceedings Article | 8 December 1997 Paper

Gain saturation studies in LG-750 and LG-770 amplifier glass

Deanna Pennington, David Milam, David Eimerl

Proceedings Volume 3047, (1997) https://doi.org/10.1117/12.294356

KEYWORDS: Data modeling, Glasses, Ions, Optical amplifiers, Amplifiers, National Ignition Facility, Laser beam diagnostics, Picosecond phenomena, Diodes, Signal attenuation

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Proceedings Article | 8 December 1997 Paper

Frequency tripling of beam noise

Jerome Auerbach, Charles Barker, Paul Wegner, David Eimerl

Proceedings Volume 3047, (1997) https://doi.org/10.1117/12.294324

KEYWORDS: National Ignition Facility, UV optics, Ultraviolet radiation, Liquid crystal on silicon, Crystals, Laser crystals, Second-harmonic generation, Apodization, Energy efficiency, Chlorine

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Proceedings Article | 8 December 1997 Paper

Alternate frequency tripling schemes

Jerome Auerbach, Charles Barker, David Eimerl, David Milam, Peter Milonni

Proceedings Volume 3047, (1997) https://doi.org/10.1117/12.294267

KEYWORDS: Crystals, National Ignition Facility, Laser crystals, Energy conversion efficiency, Frequency converters, Modulation, Frequency conversion, Phase modulation, Pulsed laser operation, Refractive index

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Proceedings Article | 8 December 1995 Paper

Phase conjugation in short-pulse megajoule-class lasers

David Eimerl, V. Chernyak, Michael Pergament, Ruslan Smirnov, Victor Sokolov

Proceedings Volume 2633, (1995) https://doi.org/10.1117/12.228279

KEYWORDS: Nonlinear crystals, Crystals, Phase conjugation, Mirrors, Optical components, Energy efficiency, Polarization, Optical amplifiers, Pulsed laser operation, Fusion energy

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Proceedings Article | 8 December 1995 Paper

Illumination uniformity requirements for direct-drive inertial confinement fusion

Joshua Rothenberg, David Eimerl, Michael Key, Stephen Weber

Proceedings Volume 2633, (1995) https://doi.org/10.1117/12.228250

KEYWORDS: Near field, Spatial frequencies, Pulsed laser operation, Physics, Switching, Speckle pattern, Multimode fibers, Modulators, Speckle, Energy efficiency

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Proceedings Article | 8 December 1995 Paper

Efficient broadband third-harmonic frequency conversion via angular dispersion

Deanna Pennington, Mark Henesian, David Milam, David Eimerl

Proceedings Volume 2633, (1995) https://doi.org/10.1117/12.228272

KEYWORDS: Frequency conversion, Crystals, Dispersion, Modulators, Data conversion, Diffraction gratings, Beam propagation method, Wave propagation, Fermium, Phase matching

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In this paper we present experimental measurements and theoretical modeling of third harmonic (3(omega) ) conversion efficiency with optical bandwidth. Third harmonic conversion efficiency drops precipitously as the input bandwidth significantly exceeds the phase matching limitations of the conversion crystals. For Type I/Type II frequency tripling, conversion efficiency begins to decrease for bandwidths greater than approximately 60 GHz. However, conversion efficiency corresponding to monochromatic phase-matched beams can be recovered provided that the instantaneous propagation vectors are phase matched at all times. This is achieved by imposing angular spectral dispersion (ASD) on the input beam via a diffraction grating, with a dispersion such that the phase mismatch for each frequency is zero. Experiments were performed on the Optical Sciences Laser (OSL), a 1 - 100 J class laser at LLNL. These experiments used a 200 GHz bandwidth source produced by a multipassed electro-optic phase modulator. The spectrum produced was composed of discrete frequency components spaced at 3 GHz intervals. Angular dispersion was incorporated by the addition of a 1200 gr/mm diffraction grating oriented at the Littrow angle, and capable of rotation about the beam direction. Experiments were performed with a pulse length of 1-ns and a 1(omega) input intensity of approximately 4 GW/cm² for near optimal dispersion for phase matching, 5.2 (mu) rad/GHz, with 0.1, 60, and 155 GHz bandwidth, as well as for partial dispersion compensation, 1.66 (mu) rad/GHz, with 155 GHz and 0.1 GHz bandwidth. The direction of dispersion was varied incrementally 360 degrees about the beam diameter. The addition of the grating to the beamline reduced the narrowband conversion efficiency by approximately 10%. Sufficient dispersion to allow nearly full phase-matching of all frequency components along the sensitive axis of the tripler allowed recovery of the narrow band conversion efficiency with bandwidth. However, even partial dispersion compensation was shown to significantly increase broadband 3(omega) conversion efficiency.

Proceedings Article | 8 December 1995 Paper

Perturbation theory for frequency doubling and tripling of electric field amplitude and phase ripples

Jerome Auerbach, David Eimerl, John Hunt, David Milam, John Trenholme, Peter Milonni

Proceedings Volume 2633, (1995) https://doi.org/10.1117/12.228273

KEYWORDS: Laser optics, Second-harmonic generation, Phase shift keying, National Ignition Facility, Frequency conversion, Modulation, Optical simulations, Beam analyzers, Crystals

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Proceedings Article | 8 December 1995 Paper

Frequency-conversion modeling with spatially and temporally varying beams

Peter Milonni, Jerome Auerbach, David Eimerl

Proceedings Volume 2633, (1995) https://doi.org/10.1117/12.228256

KEYWORDS: Crystals, Phase shift keying, Wave propagation, Modulation, Refractive index, Laser crystals, Energy conversion efficiency, Fourier transforms, Beam propagation method, Phase modulation

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Proceedings Article | 8 December 1995 Paper

Four-color beam smoothing irradiation system for laser-plasma interaction experiments at LLNL

Deanna Pennington, Mark Henesian, Russell Wilcox, Timothy Weiland, David Eimerl, Robert Ehrlich, Curt Laumann, John Miller

Proceedings Volume 2633, (1995) https://doi.org/10.1117/12.228255

KEYWORDS: Fermium, Frequency modulation, Speckle, Picosecond phenomena, Diagnostics, Frequency conversion, Laser systems engineering, National Ignition Facility, Speckle pattern, Crystals

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A novel four-color beam smoothing scheme with a capability similar to that planned for the proposed National Ignition Facility has been deployed on the Nova laser, and has been successfully used for laser fusion experiments. Wavefront aberrations in high power laser systems produce nonuniformities in the energy distribution of the focal spot that can significantly degrade the coupling of energy into a fusion target, driving various plasma instabilities. The introduction of temporal and spatial incoherence over the face of the beam using techniques such as smoothing by spectral dispersion (SSD) can reduce these variations in the focal irradiance when averaged over a finite time interval. One of the limitations of beam smoothing techniques used to date with solid state laser systems has been the inability to efficiently frequency convert broadband pulses to the third harmonic (351 nm). To obtain high conversion efficiency, we developed a multiple frequency source that is spatially separated into four quadrants, each containing a different central frequency. Each quadrant is independently converted to the third harmonic in a four-segment Type I/Type II KDP crystal array with independent phase-matching for efficient frequency conversion. Up to 2.3 kJ of third harmonic light is generated in a 1 ns pulse, corresponding to up to 65% intrinsic conversion efficiency. SSD is implemented by adding limited frequency modulated bandwidth to each frequency component. This improves smoothing without significant impact on the frequency conversion process. The measured far field irradiance shows 25% rms intensity variation with four colors alone, and is calculated to reach this level within 3 ps. Smoothing by spectral dispersion is implemented during the spatial separation of the FM modulated beams to provide additional smoothing, reaching a 16% rms intensity variation level. Following activation the four-color system was successfully used to probe NIF-like plasmas, producing less than 1% SBS backscatter at greater than 2 multiplied by 10¹⁵ W/cm². This paper discusses the detailed implementation and performance of the segmented four-color system on the Nova laser system.

Proceedings Article | 8 December 1995 Paper

Measurement of the Bespalov-Talanov gain spectrum in a dispersive medium with large n2

Paul Wegner, Michael Feit, Joseph Fleck, David Eimerl

Proceedings Volume 2633, (1995) https://doi.org/10.1117/12.228274

KEYWORDS: Glasses, Dispersion, Refractive index, Cameras, High power lasers, Laser beam diagnostics, Silica, Laser glasses, Laser systems engineering, Amplifiers

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Proceedings Article | 8 December 1995 Paper

Configuring NIF for direct-drive experiments

David Eimerl, Joshua Rothenberg, Michael Key, Stephen Weber, Charles Verdon, Stanley Skupsky, John Soures, Robert Craxton

Proceedings Volume 2633, (1995) https://doi.org/10.1117/12.228251

KEYWORDS: National Ignition Facility, Modulation, Crystals, Pulsed laser operation, Terahertz radiation, Fusion energy, Spherical lenses, Speckle, Optical simulations, Laser glasses

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Proceedings Article | 1 May 1993 Paper

Phase screens for control of the focal irradiance of the Nova laser

Janice Lawson, Sham Dixit, David Eimerl, Mark Henesian, Kenneth Manes, Amber Morgan, Howard Powell, Ian Thomas, John Trenholme, Bruce Woods

Proceedings Volume 1870, (1993) https://doi.org/10.1117/12.154473

KEYWORDS: Computer generated holography, Binary data, Fusion energy, Silica, Polymethylmethacrylate, Polymers, Coating, Deep ultraviolet, Resistance, Etching

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Proceedings Article | 1 April 1992 Paper

High-bandwidth second-harmonic generation in partially deuterated KDP

Mark Webb, David Eimerl, Stephan Velsko

Proceedings Volume 1626, (1992) https://doi.org/10.1117/12.58105

KEYWORDS: Crystals, Second-harmonic generation, Refractive index, Laser crystals, Nonlinear optics, Neodymium glass lasers, Frequency conversion, Nonlinear crystals, Statistical analysis, Harmonic generation

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Proceedings Article | 1 April 1990 Paper

KD*P frequency doubler for high-average-power applications

Mary Norton, David Eimerl, Christopher Ebbers, Stephan Velsko, Charles Petty

Proceedings Volume 1223, (1990) https://doi.org/10.1117/12.18398

KEYWORDS: Crystals, Absorption, Thermography, Laser crystals, Pulsed laser operation, Diffraction, Thermal effects, Laser damage threshold, Frequency conversion, Near field optics

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Showing 5 of 16 publications

Course Instructor

SC050: Frequency Conversion in Second Order Materials

This is an introductory laser course in second harmonic generators and other similar nonlinear frequency conversion devices. It covers what you need to know to make it work in the laboratory and in the field, and what you need to know to buy and specify the crystal for your application. It will cover a brief survey of the necessary basic theory, and the following applications: internal and external cavity devices, single pass-through devices, harmonic generators and optical parametric amplifiers, high average power devices.

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